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My install was interrupted, now when it boots it won't load the finder. I did not use time machine, is there anyway to boot via the install disk and reinstall the update that i downloaded to a flash drive.

The only way I know out of your problem is probably insert the 10.6 DVD that you used ti install Snow Leopard and do a reinstall. With SL default is Upgrade so you will not loose any of your files and settings, but you will have to rerun all the updates when it's done.

One thing you could try as I am sure it will not hurt, is first boot into the OSX DVD and run Disk Utility from the Utilities drop down up top. Repair permissions. Probably will not work since you interrupted the update, but worth a quick try.

So, I had to step away for a few days and I tried to reinstall this afternoon form the SL DVD. It's doing the same thing... It loads to the desktop, then goes back to the grey screen and the cog turns, back to the desktop, back to the grey screen and cog. Do I have to reformat and go from scratch?

What I suggested is what you did. If that did not work, either there is an issue with the hard drive or some other hardware, or a config (plist) file is messed up which the upgrade is still using. It's rare when the upgrade does not fix it.

Not sure I understand....? You're trying to upgrade from 10.4.8 to 10.6.8 using the Snow Leopard upgrade disk? If you are, it won't work. You need to do a clean install which means erase, reformat, and then install Snow Leopard 10.6.8.